Thanks for sharing !
We had some ideas like that, but we didn't have time to implement everything unfortunately. Some way to freeze your light/dark balance would be great indeed. We had an idea for a sorcerer type enemy that would mess up your karma, "cursing" you to gain a lot of light / shadow over time, and be able to flip existing enemy's karma.
Unfortunately the current game balance doesn't really allow for that but who knows if we expand the game a bit we'll revamp some stuff and focus more on karma being a resource.